Preheat oven to 350 degrees. Lightly spray a 9x13 inch casserole dish with cooking spray.
In a large bowl whisk together sugar, flour, cinnamon, ginger and 1/2 cup pecans. Add the apples and coat. Add the lemon juice and toss until coated. Spread apples evenly in the dish.
To make the crumb topping: In a medium sized bowl mix flour, sugar, white sugar, cinnamon, and nutmeg into the bowl. Add the butter and using a pastry blender or fork mix until coarse crumbs form. Stir in 1/2 cup pecans. Sprinkle on top of apples.
Bake for 40 minutes or until apples are tender and top is lightly brown.